从类中获取所有静态属性

Question

I know that there are many questions like this, but I couldn't find any answer to what I'm trying to do.

Considering the following abstract class:

public abstract class TestBase
{
    public static ITest Test => Container.Resolve<ITest>();
    public static ITest1 Test1 => Container.Resolve<ITest1>();
    public static ITest2 Test2 => Container.Resolve<ITest2>();
    public static ITest3 Test3 => Container.Resolve<ITest3>();
}

I'm trying to get all the properties that inherit from an interface IDummy like this:

    var members = typeof(TestBase).GetMembers(BindingFlags.Static | BindingFlags.Public)
        .Where(f => f.GetType().IsAssignableFrom(typeof(IDummy)) == true);

but the list is empty. Without adding the where clause " .Where(f => f.GetType().IsAssignableFrom(typeof(IDummy)) == true) " I get all the results including the getters for the properties.

Probably is something trivial, but as I'm not so familiar with reflection I can't figure out what I'm doing wrong.

Answer 1

What you get back from GetMembers is MemberInfo instances (or, for fields, FieldInfo instances). Hence, you cannot check these objects directly for being assignable from IDummy .

What you actually want to do is filter the MemberInfo objects for fields, then check the FieldType property of each of these objects:

var members = typeof(TestBase).GetMembers(BindingFlags.Static | BindingFlags.Public)
    .OfType<FieldInfo>()
    .Where(f => typeof(IDummy).IsAssignableFrom(f.FieldType));

Also, note that I turned around the subject and object of the IsAssignableFrom call, as also suggested in Patrick's comment .

---

As I just noticed, your example seems to show properties rather than fields . The general technique is the same, though; just use PropertyInfo and PropertyType rather than FieldInfo and FieldType , respectively.

Lastly, rather than filtering for PropertyInfo yourself, you could also use the one of the overloads of the GetProperties method directly.